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TPS62932: Properly spec'd VIn is causing the device to fail

Boyer Jeff
Prodigy 80 points
Part Number: TPS62932

Tool/software:

I'm using the TPS62932 as shown in the attached diagram. The device is working per spec except when I do the following;

I run the device for a while (can be more then 24 hours) with a Vin of 25V and I randomly remove the input voltage and then reconnect it. When I do this the device will blow out with Vin shorted to both GND and BST..

This appears to happen randomly while power cycling Vin about 1 out of 5 times and has happened on multiply boards. 

With these Vin power cycles, Vin is always consistent at 25V., the load on the TPS6293 can be varying but never exceed 200mA, and as the attached schematic shows, I believe I'm using the part correctly.

So can you please help me debug this problem?

Thx

Jeff Boyer | Owner & Director Of Engineering | TekMagic

Email: Jeff.B@TekMagic.net 

  • +1
    TI__Mastermind 20586 points

    Hi Jeff

    How did you disconnect the VIn and re-connect it? Is there a long cable on the input side? Did the Vin rise fastly? Can you measure the Vin waveform when re-connect the VIn and see is there an overshoot? The Vin_abs_max is 32V.

    And can you share the layout image?

    Thanks and best regards.

  • 0
    TI__Mastermind 20586 points

    Hi jeff

    I will close this thread due to inactivity, please feel free to let me know if there are other questions.

    Thanks and best regards.